Experiment And Optimized Modeling On Seismic Performance Of RC Column

As the main load-bearing component of RC frame structure, reinforced concretecolumn bears both the vertical load and the horizontal load. The destruction of thecolumn can easily cause the destruction of the entire structure. Therefore, to accuratelypredict the reinforced concrete column’s mechanical performance in earthquake and thedeformation properties after the yielding of longitudinal reinforcement, especially thedegradation characters of stiffness and horizontal load after the peak load, is of greatsignificance in assessing the vulnerability and safety of structure.This paper’s main research work and conclusion:①This paper has a low of cyclic the load test on two cantilever columns andinvestigates what influences the longitudinal reinforcement strength and axialcompression ratio have on the specimen’s seismic performance, and measured theflexural deformation, shear deformation and the bond-slip of the plastic hinge area, eachspecimen gets horizontal force-lateral vertex curve, the horizontal force flexture rotationcurve, the horizontal force-angle of shear curve, the horizontal force-the fixed endrotation hysteresis curve, and by collating and calculating the data, the contribution ofthree kinds of deformation on the lateral vertex is analyzed.②In the numerical simulation analysis, in order to more accurately predict therelationship between the specimen’s horizontal force and its lateral vertex hysteresis, thedifferent confined concrete models and reinforcing bar models provided in theOpenSees part are compared, and the effect of the number of integration points and thenumber of fibers divided on the calculation accuracy is examined, the paper obtains athe optimization model of single component.③Based on the approach that obtains the optimization model of single component,the reinforced model, taking buckling and fatigue damage into account, is introduced,numerical simulation are made on eight reinforced concrete cantilever columnsrespectively. Through the comparative analysis of simulation results this paper finds thatfor the specimens whose axial compression ratio are small, taking into account thesimulation results of the longitudinal reinforcement buckling and fatigue damagereduces significantly the difference between the predictive value and the actualexperimental value of horizontal bearing capacity of the specimen at the targetdisplacement, the simulation of the specimen’s pinching effect also achieved good results; for the specimens whose axial compression ratio are big, although thesimulation considering the longitudinal reinforcement buckling and fatigue damage cannot accurately predict the horizontal bearing capacity of the specimens at targetdisplacement, the predictive value and the actual experimental value of the horizontalbearing capacity degradation rate of the specimen after the peak bearing capacity areroughly the same.④In order to investigate what impact ignoring longitudinal reinforcement slippageand shearing effect may have on the simulation calculation results, one of reinforcedconcrete cantilever column is made simulation in its OpenSees part taking into accountthe longitudinal reinforcement slippage and shearing effect, by the comparative analysisof the simulation results, we find that to ignore the longitudinal reinforcement slippageand shearing effect will not bring significant errors to the calculation results.